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DEPARTMENT OF DEFENSE
FICE OF TEST INFORMATION
Washington 25,
A-157 (3-12)
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D.
C.
408838
FOR IMMEDIATE RELEASE
HAzelwood 7-7831
(Thursday, June 26, 1958).
Ext. 3446
DANGER AREA FOR JOHNSTON ISLAND NUCLEAR TESTS ANNOUNCED;
UNAUTHORIZED ENTRY PROHIBITED
As part of the safety precautions for the forthcoming
nuclear tests at Johnston Island, a surface danger area around
the island will be established effective July 25, 1958.
On May 2, 1958, it was announced that certain short-
range defensive missiles with nuclear warheads would be fired
from Johnston Island, as part of the HARDTACK series of nuclear
tests in the Pacific.
Johnston Island is located about 540
statute miles southwest of the nearest inhabited island of the
Hawaiian chain and about 900 statute miles from the next nearest
inhabited island.
All ships are cautioned to remain clear of an area
bounded by a circle of 400 nautical mile radius centered at the
following geographic coordinates:
Longitude 169° 31' West
Latitude 16~
45! North,
It is estimated that the surface danger area will remain in effect for a period of approximately three or four weeks,
Notice of the establishment of the danger area is being given
the widest possible distribution through marine and international
organizations.
An air danger area will be established by warnings to
alrcraft issued by the Civil Aeronautics Administration shortly
before the firing time planned for each test.
This will permit
maximum utilization of the area by normal air traffic.
July 25, 1958.
BF ICI
Unauthorized entry into the danger area surrounding
Johnston Island by U. S. citizens and all other persons subject
to the jurisdiction of the United States is prohibited beginning